CVE-2026-98085 (GCVE-0-2026-98085)
Vulnerability from cvelistv5
Published
2026-09-25 10:24
Modified
2026-10-21 12:54
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: backtrack_insn(): Handle ld_{abs,ind} subprog exit edge Nicholas Carlini reported a bug in precision backtracking mechanism for BPF_LD | BPF_{IND,ABS} instructions. These instructions are modelled as two branches: - fallthrough; - implicit exit from current subprogram. The implicit exit case was not handled by the backtrack_insn() function. When backtracking such a path backtrack_insn() did not call bt_subprog_enter(), which meant that backtracking continued manipulating precision marks in a caller frame, while looking at instructions in a callee frame. This lead to segmentation faults during verification (see the selftest), or unsound state pruning.
References
Impacted products
Vendor Product Version
Linux Linux Version: 37ad2bb11e9de92cb7b94548705eeedd87f7d392
Version: 8674e2db06cff6b50f2216eed9a761d15425bb34
Version: ce01a4e5cfac7adbe0be565f90cd32ecbb2f8337
Version: ee861486e377edc55361c08dcbceab3f6b6577bd
Version: ee861486e377edc55361c08dcbceab3f6b6577bd
Version: 928d354ae3557e8f755a227e67be88034eb3cd7f
Version: 8a800497d9f6c2ec9c2c1ba7b71d0ac2ea7f7bbe
Version: de1055e7f9e67af32b1f3376066272b04e5223c0
Version: d846d83bdacbd8f14fc45c63b8c1d22608452e1c
Version: 6.6.148   ≤
Version: 6.12.101   ≤
Version: 6.18.42   ≤
Version: 5.10.265   ≤
Version: 5.15.216   ≤
Version: 6.1.183   ≤
Version: 7.0.10   ≤
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: backtrack_insn(): Handle ld_{abs,ind} subprog exit edge\n\nNicholas Carlini reported a bug in precision backtracking mechanism\nfor BPF_LD | BPF_{IND,ABS} instructions. These instructions are\nmodelled as two branches:\n- fallthrough;\n- implicit exit from current subprogram.\n\nThe implicit exit case was not handled by the backtrack_insn()\nfunction. When backtracking such a path backtrack_insn() did not\ncall bt_subprog_enter(), which meant that backtracking continued\nmanipulating precision marks in a caller frame, while looking at\ninstructions in a callee frame.\n\nThis lead to segmentation faults during verification (see the\nselftest), or unsound state pruning."
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        "shortName": "Linux"
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    "cveId": "CVE-2026-98085",
    "datePublished": "2026-09-25T10:24:20.485Z",
    "dateReserved": "2026-09-25T10:19:56.075Z",
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